

   MMaayyoo CClliinniicc PPrriimmaarryy BBiilliiaarryy CCiirrrrhhoossiiss DDaattaa

        data(pbc)

   FFoorrmmaatt::

        age:          in years
         alb:         serum albumin
         alkphos:     alkaline phosphotase
         ascites:     presence of ascites
         bili:        serum bilirunbin
         chol:        serum cholesterol
         edema:       presence of edema
         edtrt:       0 no edema, 0.5 untreated or successfully treated
                      1 unsuccessfully treated edema
         hepmeg:      enlarged liver
         time:        survival time
         platelet:    platelet count
         protime:     standardised blood clotting time
         sex:         1=male
         sgot:        liver enzyme (now called AST)
         spiders:     blood vessel malformations in the skin
         stage:       histologic stage of disease (needs biopsy)
         status:      censoring status
         trt:         1/2/-9 for control, treatment, not randomised
         trig:        triglycerides
         copper:      urine copper

   DDeessccrriippttiioonn::

        Followup of 312 randomised and 108 unrandomised
        patients with primary biliary cirrhosis, a rare autoim-
        mune liver disease, at Mayo Clinic.

   SSoouurrccee::

        Fleming TR, Harrington DP. "Counting Processes and Sur-
        vival Analysis" Wiley:New York

